Anthracene dye.



UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

MAX KUGEL, OF VVIESDORF, GERMANY, ASSIGNOR TO FARBENFABRIKEN OF ELBERFELD 00., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ANTHRACENE DYE.

SPECIFICATION forming part Of Letters Patent N 0. 729,073, dated May 26, 19.03. Application filed February 1'7, 1903. Serial No. 143,863. (No specimens.)

To all whom it may concern.-

Be it known that I, MAX KUGEL, doctor of philosophy, chemist, residing at Wiesdorf, near Cologne, Germany, (assignor to the FAR- BENFABRIKEN or ELBERFELD 00., of New York,) have invented a new and useful Improvement in New Anthracene Dye; and I hereby declare the following to be a clear and exact description of my invention.

My invention relates to the manufacture of new dyestuff sulfonic acids of the anthracene series by causing sulfonating agents to act on the anthraquinone derivatives described in my application for Letters Patent bearing :5 the Serial No. 134,125, filed December 6, 1902.

The said bodies, which are most probably oxazin derivatives, are obtained by causing oxidizing agents to act on such alpha-alphylamidoanthraquinones or derivatives thereof as contain a hydroxy group in ortho position to the alphylamido group, such as l-toluido- 2-oxyanthraquinone, 1-anilido-2-oxy-3-bromoanthraquinone, 1-anilido-2-4-dioxyanthraquinone, 1-5-diani1ido-2-4-6-8-tetraoxyanthraquinone, or the like. The new dyestuff sulfonic acids obtained by the sulfonation of these bodies are in the shape of their alkaline salts colored powders, which are soluble in hot Water with from violet to greenish-blue color.

rivative obtainable by oxidation of l-parato luido-2-et-dioxyanthraquinone, which body is most probably an oxazin derivative having the following formula:

are mixed with two hundred and fifty parts of fuming sulfuric acid, (ten per cent. S0 The resulting mixture is then heated to about from 70 to 80 centigrade until a test portion is clearly dissolved by hot water. The reaction mass is poured into about two thousand parts of ice-Water. The resultlng precipitate is filtered off, washed with a solution of common salt, and dried.

When dry and pulverized, the new colorlngmatter is a dark-blue powder, which is soluble in water with a blue color and nearly insoluble in dilute acids. By concentrated sul- -furic acid (of 66 Baum) it is dissolved with ably oxazin derivatives, which can be prepared by causing oxidizing agents to act on I such alpha alphylamidoanthraquinones as is, when dry and pulverized, in the shape of its sodium salt, a dark-blue powder soluble in water with a blue color and nearly insoluble in dilute acids, being dissolved by concentrated sulfuric acid of 66 Baum with a bluish-green color, dyeing unmordanted Wool blue and chrome mordanted wool green shades, substantially as hereinbefore described.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

MAX KUGEL.

\Vituesscs:

OTTO KONIG, J. A. RITTERSHAUS. 

